Insurance - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Jan. 31, 2017	Apr. 30, 2017
Schedule of Other Liabilities
Self insurance retention amount per-claim	$ 1,000,000		$ 1,000,000
Insurance policy coverage, general and automobile liability losses	200,000,000		200,000,000
Insurance policy coverage, property damage	75,000,000		75,000,000
Change in insurance claims	5,000,000	$ 5,000,000	10,000,000
Minimum
Schedule of Other Liabilities
Primary policy limit	1,000,000		1,000,000
Maximum
Schedule of Other Liabilities
Primary policy limit	5,000,000		5,000,000
Self insurance retention amount per-claim, medical plan	$ 400,000.0		$ 400,000.0